Striker bar for bag machines



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STRIKER BAR FOR BAG' MACHINES Filed July 30,

Patented Apr. 18, 1933 UNITED STATES y STRIKER BAR FOR BAG MACHINES Application led July 30,

This invention relates to a striker bar for paper bag machines and the like, and it is an object of the invention to provide a striker bar mechanism of more rigid construction than heretofore and one which is more efficient in action..

A feature of the invention consists in the provision of a striker bar which moves directly in the line of travel of its supporting sprocket cha-ins as distinguished from the usual arrangement whereby the striker bar is offset from the line of travel of the chains.

Another feature consists in the provision of a striker bar whose axis is in line with the axis of the chain link pivot pins or may take the place of the usual link pin.

A further Jfeature of the invention consists in the provision of a. frame composed of two rods, each of which passes through the sleeves which support the chain rollers, the rods being rigidly connected, as for instance by split clamps.

Further features of the invention and details of construct-ion will be better'understood by reference to the accompanying drawing in which- Figure 1 is a perspective view of a portion of two sprocket chains which support the striker bar mechanism between them;

Figure 2 is a longitudinal section through one chain and a frame; and

Figure 3 is Figure 2.

The type of machine to which this invention applies is illustrated in my Patent No. 1,798,168, issued March 31, 1931. In Figure l of said patent a. sprocket chain is shown at 96 and the striker bar at 98. The'web or paper out of which the bags are subsequently formed is rst wrapped about a former to form a bag tube, which tube is severed into bag lengths by the operation of the striker bar, the bag walls being severed by the knife edges 90 and 92. The sprocketv chains in these machines are situated one on each side of the machine frame and the striker bar is supported between :the chains.

In the construction shown in the patent the portion of the striker bar a section on the line 3 3,

1932. serial No. 626,597.

striker bar is not situated centrally in the line of travel or the sprocket chain but is odset therefrom and consequently at every action of the bar it has a tendency to rock, thereby setting upvibrations which maybe particularly objectionable in some classes of work. Y q In the present 'application IV have 4not Villustrated any of the details'of the machine i because this may be of theusual and well` knowntype. My improved striker bar mechanism, however, is applicable to various types'` er machines in which the bag tube is severed v by the action of a'striker bar.

For Athe purpose of illustration I` have sho-wn `a roller chain, each link of which is made up of side members 2 which are apertured for'the reception of bearing Sleeves 4, Figure 2, which maybe o-hardened steel,each sleeve carrying a roller 5. Each link is con nected to an adjacent linkby side members 6 and a pvot pin 7 is passedthrough the sleeve and, through the side members 6. These pivot pins may bev riveted orA they may be Cotter pins, both constructions being well known. p

The striker bar construction of the present invention consists of an upper bar orrodS and a lower bar orv rod 10, the rods being preferably'circularin form and having their ends of such diameter as to lit into the opening 1n the bea ring sleeve of a link roller and serving as pivot pins fortwo adjacent links. V The Y upper bar 8 is the striker `bar proper, the lower bar merely actingto give rigidity to the 85 structure, the two bars and link members constituting a frame. By reason of the fact that the rod 8 passes through the roller bearing its axis is necessarily in line with the piv- 4' ot for the roller and consequently the bar' '9D travels in a path which is centrally in line lwith the travel of the chain. fore no tendency on the part of the striker bar to move out of its direct path of motion y when it hits the bag tube. "g5 In order to give additional rigidity to the striker bar structure a clamping member 11 is provided, each adjacent end oi the rods 8 and 10 and each clamp is apertured to fit the n rods as shown in section in Figure 3. Each 10U There is there- Y l clamp is slotted between apertures and a clamping screw 14 securely clamps the rods together. There is thus provided a very rigid structure which is not only more eiii- 5 cient because of its rigidity but in which there is no tendency to set up undesirable vibrations. v Y

Thegrod as actually shown is somewhat larger in diameter than the rod 8 forming the 10 striker barproper and this has been so shown to emphasize the fact that the striker bar 8 may be of a diameter suited to the work in hand.

What I claim as new is l. In a bag machine, in combination,

sprocket chains having pivoted links, a strik- 1 er bar frame supported between the chains, said frame comprising a rod passing through the roller bearing in each chain, and a sec- '20 ond rod passingthrough the roller bearing of an adjacent link of each chain.

2. In a bag machine, in combination, sprocket chains c having pivoted links, a striker bar frame supported between the chains, said frame comprising a rod passing through the roller bearing in each chain, a second rod passing through the rollervbearing otanadj acent link of each chain and means rigidly connecting said rods.

'30 3. In a bag machine, in combination,

sprocket chains having pivoted links, a striker bar frame supported between the chains, said frame comprising a. rod passing through the roller bearing 1n each chain, a

second rod passing through the roller bearing of an adjacent link of each chain and a clamping member adjacent'the ends of the rods and engaging both of them.

4. In a bag machine, in combination,

'40 sprocket chains having pivoted links, a

striker bar frame supported between the chains, saidV frame comprising a rod passing through the roller bearing of an adjacent link of each chain and aclamping member engaging the ends of the rods, said members having apertures through which the rods pass, a slot connecting the apertures, and a screw Jor clamping each member to the rods.

Signed at Brooklyn this 29th day of July GEORGE W. POPPE. 

